Freeza shows off, using telekinesis to levitate a group of six small rocks around him.
Pressing LP fires a single rock forward. Upon hitting the opponent, it does absolutely minute damage but counts as a genuine hit with hitstun and thus can be used to extend combos.
Press forward+LP to fire a single rock forward faster than with neutral LP. You cannot fire out a rock if you're holding Back on the directional pad.
Also note that hitting with a Single Rock takes a way a little bit of the Sadism bar.
Inputting QCF+K with at least one rock still present makes you fire ALL remaining rocks across the screen.
LK fires them straight forward, MK diagonally upwards and SK vertially up.
All of these rock throwing moves can be performed while in the air as well, but the directions of the MK and SK versions will be swapped (firing them down, not up).
Unlike the Single Rock, hitting the opponent with All Rocks will fill up your Sadism bar.
Once you've ran out of rocks, you can perform the activation command again and start over.